To provide a compost fermentation tank contributing to a reduction of a running cost.
The ventilators 4 of the compost fermentation tank provided with the ventilators for ventilating the mixture housed therein are formed to multiple stages and the lower parts of the ventilators of the respective stages are provided with transfer devices 5 of a rotary type. These transfer devices 5 of the rotary type are provided with revolving shafts 6 and fins mounted at these revolving shafts. The transfer devices 5 of the rotary type are disposed in a plurality in the lower parts of the ventilators 4, 4 of the respective stages. The mixture 15 is transferred successively from the upper stages to the lower stages by the intermittent driving of the transfer devices 5 of the rotary type.
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